A well is required in all Common Housing blocks to evolve the house beyond a basic hut. Without access to clean drinking water, City Health is likely to plummet, causing outbreaks of disease in the city.

Wells can be improved, which improves the quality of water provided by the well, as well as sending out two water carriers to distribute water to the city.

Areas designated for Elite Housing do not require access to a well, as they can procure their own water supplies.